お前か

is it you?

→ 御前
phrase Uncommon #12,436
is it you? お前 is a rough, very informal way to say “you.” Depending on context, this can also express surprise at recognizing someone, like “Oh, it's you.”
JA: あ、お前か。ここで何してる?
EN: Oh, it's you. What are you doing here?

なんだお前か

Oh, it's you.

— Carandiru (2003)

お前か?

Is that you?

— ワンス・アポン・ア・タイム・イン・ハリウッド (2019)

トミーお前か

Tommy, is that you?

— グッドフェローズ (1990)

ようお前か

Oh, it's you.

— シティ・オブ・ゴッド (2002)

お前かそれとも僕か!

You or me!

— きっと、うまくいく (2009)

またお前か

You again?

— 荒野の用心棒 (1964)

お前か何してる?

Oh, it's you. What are you doing?

— ラブ・アクチュアリー (2003)

お前か!

It was you!

— バトル・ロワイアル (2000)

ドアを閉めたのって、お前か?

Were you the one who closed the door?

それで、死んだ男は……お前か!

So the dead man was... you!

本当に―お前か?

Is it really you?

— マルコムX (1992)

お前か

You?

— インディ・ジョーンズ/最後の聖戦 (1989)

さっき歌詞を思い出したのはお前か?

Were you the one who just remembered the lyrics?

— ソング・オブ・ザ・シー 海のうた (2014)

会う約束をしたのはお前か

Were you the one who made plans to meet?

— ウエスタン (1968)

今の声お前か?

Was that your voice just now?

— GHOST IN THE SHELL (1995)

司もしかしてお前か?

Tsukasa, could it be you?

— 君の名は。 (2016)

警察に電話したのは、お前か?

Were you the one who called the police?

お前か?

Is that you?

— ミッション・クレオパトラ (2002)